Connecting a 3-key switch. Three-gang switch with socket

It takes one switch to turn on one light bulb. To turn on the chandelier, they usually put beautiful two- or three-key devices. But it's not three switches in one box. A three-key switch can turn on a three-light chandelier as a whole, but only all the bulbs together or separately, as you like. Or turn on three different lamps in the room from one point. Or different lamps in three different places, for example, one switch per lamp in the hallway, bathroom and toilet.

And it's very economical. At least you can save on wire. Well, turn on / off not everything at once, but specifically as much as necessary

Device and circuit

This is a box made of an insulator (fireproof plastic), in which a triple mechanism for opening / closing contacts is installed, terminals for connecting wires: a common wire (phase from an automatic machine or a junction box), three wires after opening, going to lamps.

There is also a fastening mechanism and external protective and decorative elements: a plastic frame-panel and keys that can be easily removed and installed on latches.

To connect the lighting of three rooms or a chandelier with three groups of light bulbs to a triple switch, you must first prepare the wiring and the mounting hole for the switch. It should turn out as shown in the diagram.

In the diagram shown, the neutral wire is routed through the junction box to all lamps (through the ceiling or the upper horizontal gate), and the phase is connected to the switch. After the switch, each of the wires brings the phase to its lamp, that is, three strokes are made - one for each lamp. This is not always good.

Wiring through junction box

It is better to bring all three phase wires to the junction box again with the same one stroke, and then bring them to the lamps along the common upper stroke. If we are wiring to the chandelier, then the last option is the best.

L - phase to the switch (red);
then the phase (yellow, brown, pink) goes to three groups of chandelier lamps;
N - working zero (blue), goes immediately
on the chandelier and bred by the terminal block of the chandelier in groups;
PE - ground (yellow-green),
connected to the body of the chandelier

Thus, before connecting the triple switch, it is necessary to prepare all the wiring.

All work should be carried out with the power supply of the lighting network turned off by automatic machines. To search for zero and phase, the power is turned on, but after finding them with an indicator and marking, it turns off again.

Search for existing wiring: you need to find a junction box, lines that will participate in the wiring. It is necessary to mark the walls for processing. A place is planned for the hole where the three-gang switch will be installed, and for wiring to and from it.
Opening existing channels and punching new ones.
Laying and securing cables from the box to the installation site. Wires for phase, zero and ground (if any) should be marked. If possible, you need to adhere to the standard colors of the wires: blue for zero, yellow-green for grounding and other colors for the phase.
Installation and fixing of socket boxes. Wires are held inside them.

Determine the wires in the junction box to which to wire. Phase and zero are indicator. They are marked (with electrical tape).

This work is carried out after the inspection made sure that the previous actions did not cause damage to the wiring. After that, the automatic lighting network is turned on and the phase of the wires of the junction box is determined, to which it is necessary to make a connection. The wires are marked, after which the power is turned off again.

The wires of the new wiring are connected to the junction box, their ends are securely insulated with special caps.

To check the correct connection, turn on the machine again and, making sure that everything is fine, check the phase on all wires. It should be on only one phase wire going through the socket to the switch. The rest should be zero: on the neutral wires going to the lamps, on the ground wires and phase wires going from the switch to the lamps, since they are open.

Turning off the machine again, you can connect the switch by connecting the wires to the terminals according to the connection diagram. After that, the switch can be put in its place, fixed in the socket according to the design.
Wires are connected to lamp sockets or chandelier terminal blocks. Two wires must be suitable for each cartridge - zero and open phase.

Before connecting each wire to a chandelier or lamp, you need to know exactly which of them are zero (coming from the junction box, blue according to the norm) and which are phase. Color identification of each wire helps. But in order for them to connect correctly, it is necessary to turn on the machine to determine and check each of them in turn with an indicator, including the corresponding button of the three-button switch.

After installing and checking that all lamp units are connected, the work can be considered completed.

How to connect a three-gang switch with a socket

When the triple switch in the hallway becomes a kind of control panel, from where you can turn on the light in three rooms that are very important for life at once - the bathroom, the toilet and the hallway itself, the opportunity to modernize it immediately suggests itself. Usually, an outlet is installed in the corridor for various everyday needs - a vacuum cleaner, for example. This is, as a rule, the center of the apartment, and from here you can reach out with a vacuum cleaner on a long wire to all its remote corners.

In such a case, manufacturers have already come up with and are producing a triple switch with a socket. The addition does not complicate the circuit very much, but there is a nuance.

The socket is supplied with phase (red wire) and zero (blue) from the distribution box.

Now there are more wires in our loop, there are five of them. And if earlier, without a socket, only a phase without a neutral wire went into the switch, there was less chance of a short circuit. Having the case of a triple switch with a socket, it was now necessary to apply a neutral wire here as well. And this dramatically increased the risk of incorrect connection and short circuit, which is not good.

The main devices with which you can control the lighting of the apartment are switches. Today, the market presents their huge selection of various design and appearance. And if a few decades ago, it was rare to find a light switch with three keys in ordinary residential premises, now they are in almost every modern home. Such a device is convenient in that it can be used to cope with three groups of lighting fixtures from one access point. And since these switching electrical devices are so popular, let's talk in more detail about how to connect a three-gang switch.

Where are they applied?

Modern repairs and design solutions are increasingly offering lighting to be divided into different groups.

For example, a room has a complex configuration - niches, ledges, partitions or curtains. Very often now large one-room apartments are divided into zones, so-called studios are made of them. In this case, a switch with three keys is the best fit. By means of specially thought out and mounted zone lighting, it is possible to highlight the working area, where there will be a computer desk, a sofa, shelves with books, here the lighting becomes brighter. The second zone is the sleeping area, where a more subdued light is quite suitable. The third zone is the living room, where there is a coffee table, armchairs, a TV, here the lighting can be combined.

When else is it advisable to use a three-gang household switch?

If from one point it is necessary to control the lighting of three rooms at once, for example, a corridor, a bathroom and a bathroom, when they are close to each other.
In the case of combined lighting in the room - central and spot.
When in a large room lighting is provided by a multi-track chandelier.
If a multi-level plasterboard ceiling is installed in the room.
When the lighting of a long corridor is divided into three zones.

Advantages

From the installation of such a triple switch, you will get some advantages:

Outwardly, one switch with three keys looks more compact and more aesthetically pleasing than three single ones.
Laying electrical wires to the connection point will be less costly in terms of labor and money.
In the wall for the mounting box, you will need to make one technological niche instead of three.
Economic effect. For example, if your chandelier has 3-4 light bulbs, then turning on a single-gang switch ensures that all of them work at once, while consuming maximum electricity. But such illumination is not always needed; dimmed light is enough. If you install a 3-key household switch for such a chandelier, then if necessary, one or two lamps turn on, thereby saving almost half of the electricity.

Kinds

Do not rush to connect a three-gang switch until you decide exactly which device you want to see in your apartment. After all, these switching devices are of several types:

Ordinary.
Checkpoints. They are used in long corridors or on different floors, when at the entrance (at the beginning of the corridor or on the first floor) the lighting turns on one switch, and at the exit (at the end of the corridor or on the second floor) it turns off the other. That is, you do not need to make your way in the dark and crawl along the wall with your hand to find the button of the switching device.
With indication. Such light beacons have two options for indicating the status of the device. Or they glow when the lighting is off and thus indicate in a dark room where the switching device is located. Or vice versa, the beacons are on when the keys are on, thereby making it clear exactly where the light is on at the moment.
Three-gang switch with socket. They are most often used in rooms where a toilet, a bathroom and a corridor are located nearby.

How to choose?

Now there is such a huge range of switches on the electrical market that you can find a suitable model and color for any design solution or interior. Nevertheless, you are well aware that the shade and appearance are far from the main indicators that you should pay attention to when choosing a device. When buying a switch with three keys, check the following:

The presence of modern self-clamping terminals, they are more convenient in operation. It is enough to insert the wire into the hole, as it will immediately be fixed.
The outer side of the product without burrs, scratches, damage.
The normal operation of all terminals, they must ensure reliable fixation of the wire cores.
The keys do not jam when pressed (on and off), they work clearly, with a well-audible characteristic click.
On the reverse side there should be a wiring diagram for the triple switch.

Try to avoid cheap Chinese wiring products. Buy devices from trusted companies and manufacturers.

Design

There are no special differences in the design of these switches. The principle of operation is the same as for two- or one-key.

Consider the main elements of the switching device.

Keys and frame, so-called protective elements. For their manufacture, a special heat-resistant plastic is used. The keys directly turn the switch on and off.

The operating mechanism or actuator that actuates the keys. The frame is connected to the working mechanism with special latches or screws. The whole structure is assembled in the assembly box and fixed in it with special spacers.

The connected three-key device must have four contacts - one to connect the mains wire, three more will connect the switch to the lighting elements. The material for the contacts is usually copper, the size varies depending on the cross section of the wire and the connected load.

The use of this type of switches is more intensive than others, so their average life is from 8 to 10 years. There are two main reasons why a device may fail:

Mechanical - fasteners were damaged, the body collapsed.
Electrical - contact damage.

Do not try to replace any components in the three-gang switch in case of one or another breakdown, the device should be completely changed. It would be better if this is done by a professional electrician in compliance with all safety rules. Although if you are familiar with electrical engineering, have the skills to work with power tools, understand what “phase” and “zero” are, it will not be difficult for you to do it yourself.

Installation and connection

Let's talk a little about how to properly install the device in question. But first of all, about the tools. You must have:

flat and Phillips screwdriver;
stripper so that you can remove the insulation, or a knife;
pliers;
tape or clamps.

A two-wire wire (phase and zero) comes from the power supply to the junction box, which is installed in the room.

The switch should have four wires. One is a phase from the mains (it comes from the junction box) and three phase wires from lighting fixtures.

The three-key device has 4 contact nodes:

input contact, the supply phase must be connected to it;
three more contacts, the phase conductors of the wires going to the lighting devices are connected to them.

The neutral wires of the wires going to the fixtures must be connected in the junction box to the neutral wire of the supply network.

When you connect the phase to the input contact of the switch, do not confuse it with the neutral wire. The switching device should break exactly the phase, and not zero. Otherwise, when replacing lamps in fixtures, you risk getting energized.

Now for some practical steps:

Before connecting the triple switch, make sure that there is no power. Turn off the introductory machine, which is installed at the entrance to the apartment. This is an important condition for any work related to electricity.
There is a wiring diagram on the back of the switch. According to it, connect the phase wires from the mains and from the lighting fixtures. The contacts are made with self-clamping terminals, so you just have to fix the wires in them.
After that, the switch is fixed in the mounting box using clamping screws. It remains only to fix the keys and the frame on top.
Connections in the junction box can be made by twisting. The wire going from the switch to the lamp is connected to the phase wire of this lighting device. A small part of the wires is cleaned, twisted together with pliers, after which the contact is isolated with a special tape. Everything can be simplified if you use modern clamps. Do the same with the other two pairs of wires. And in the same way, they connect the neutral wires of three lighting fixtures to the zero of the network.
It remains to check the connected switch. Turn on the introductory automatic machine for the apartment and, by successively pressing the keys of the mounted switching device, check whether the lamps of the lamps light up.

A device with which you can control three independent lamps is undoubtedly a very successful and profitable invention of mankind. But still, before you connect the switch, evaluate your knowledge and strength. There are times when it is better to trust professionals.

At first glance, connecting a three-gang switch can cause difficulties and misunderstanding for a person who does not deal with electricity every day. In fact, there is nothing complicated in this. If you have ever installed a switch, you know that in a single one there is only one output terminal, and in a double one there are two. So, the three-key switch differs only in that it has as many as three output terminals.

This saves a lot of space on the wall, especially when such a switch is connected to a socket in the housing. Agree, it is very convenient to turn on / off the light from one place in different corners (in the toilet, corridor and bathroom) or adjust the brightness of the light of several bulbs, different lamps or lighting zones in one room / room. Which, by the way, will help save electricity by 20-30%.

How to connect a triple switch correctly

Before connecting a three-gang switch, be sure to turn off the power by turning off the machines near the meter. If there is a public access to the circuit breakers, hang a note on it about the installation work.

For work you will need:

flat or curly screwdriver;
pliers;
knife or stripper (for greater convenience);
insulating tape;
indicator screwdriver;
WAGO terminal blocks or others.

First you need to disassemble the three-pin switch to get to its terminals. This is done easily: pry the keys themselves with something thin, and then remove the frame. Now let's take a closer look at connecting a triple switch. There should be four wires going to it. It can be a four-core cable at once, one core of which will be a phase. Although more common is the exit from the wall of a single-core wire - a phase - and a three-core one nearby - for lighting devices. You can determine the phase using an indicator screwdriver.

Connection is done in just three steps:

We connect the neutral wires of all consumers (luminaires) with a zero supply. They are marked in blue in the figure. It is convenient and practical to use WAGO terminal blocks to connect wires, although you can get by with any other or simple twisting, only then do not forget to insulate the connection.
We connect the phase of the supply wire (brown) with the common wire of the light switch (white).
We connect together all the phase wires from the switch and fixtures. For a better understanding, we have compiled the entire scheme in accordance with the color coding (green with green, etc.).

Note! Only the phase wire should go to the input of the three-gang switch! If zero is interrupted, the bulbs will also work, but then the wiring will remain energized when the power is off. This means that even when replacing the lamp, there will always be a risk of electric shock.

The wires in the switch are fastened with clamping screws. No more than 5-10 mm of insulation is removed from the cable so that there are no bare wires. If the wire is stranded, use special NShVI lugs so that it does not break off when the screws are tightened.

That's all. As a result, our three-gang switch connection diagram is assembled. It remains to mount it in the socket, unfasten it with screws and install the lining with the keys in place.

By the way, the version of the multipole switch with a socket has almost the same circuit. The only difference is that a separate neutral wire is connected to the outlet, and the phase is common. It can be connected either by parallel cables (separately to the socket and separately to the switch), or by one cable (by a jumper from the socket outlet to the common contact of the switch). The figure below shows the diagram of the second connection.

Note! Overhead switches are produced for installation on fragile walls or wooden surfaces. They are also suitable for temporary use.

Some rules:

Carefully inspect the device in the store. All three keys should work smoothly, without jamming, with characteristic clicks.
There should be no scuffs, scratches or cracks on the outside.
It is preferable to take breakers with a block base made of ceramic or thick metal. They better withstand overheating and high stress, unlike plastic.
Pay attention to the degree of protection of the shell, if, of course, this matters to you. It is marked with the letters IP and two numbers. The first digit is protection against foreign objects: 0, 1 - not used in everyday life; 2 - protection against getting a finger; 3 - protection against ingress of wires and tools with a diameter of up to 2.5 mm; 4 - protection against small parts (wire, pins, etc.); 5, 6 - dustproof models. The second digit is moisture protection: 0 - absent; 1, 2 - protection against vertically falling drops of water; 3, 4 - for the street; 5, 6 - protection from strong jets (shower, ship, etc.); 7, 8 - withstand immersion in water, but such models are almost never found.
Do not forget that switches are made for three positions with illumination. They are very handy if you need to turn on or control the lights in the dark. This way you will see which key is enabled and which is not. Illuminated switches come in one and two positions.

Note! To illuminate long corridors, stairs or houses with several floors, three-gang pass-through switches are produced. They allow you to turn on the light in one place, for example, on the first floor, and turn it off on the second. Agree - this is convenient, because you do not need to sneak in the dark and grope for the keys with your hand. True, they should connect a little differently, but this is a topic for a separate article.

These are not all models of triple switches that can be found in electrical stores. There are decorative (colored, cherry, wood, etc.), waterproof, child-resistant, USB output, LED backlit and many other options.

The switch is the main device designed to control the lighting in the apartment. A few years ago, a triple switch was a rarity in homes, but now it is very popular among the population. There is a huge range of such devices that differ in design and modification. The practicality of its application lies in the possibility of regulating three light sources from one control point. If there is a need for such devices, then you need to know how to properly connect a triple switch.

Areas of use

Interior designers are increasingly offering to distinguish between light groups. Multi-level ceilings, arches, niches require separate lighting. Modern studio apartments, divided into zones, provide slightly subdued light in the recreation area, bright lighting in the functional area near the computer, bookcase, chairs. In the living area, where there is a TV, a sofa and a dining table, you can use a combined light.

How to connect a triple light switch so that it is convenient to use? It will fit:

in the corridor to connect to the lighting of three rooms at once - a bathroom, a toilet and a kitchen, if they are close to each other;
if the room has a multi-track chandelier or combined lighting (main and additional);
when the ceiling is made in several levels;
if it consists of three parts;
if you want to control the lighting of three rooms from one point.

Benefits of using

Why is it beneficial to put a triple switch? How to connect it to get benefits?

Ergonomics - one device looks more beautiful instead of three.
Profitability of cable laying - less financial and labor costs will be required.
The need for one hole in the wall, instead of three.
Economical in energy consumption, since full lighting with all the bulbs is not always required, sometimes you can get by with a part.

Types of triple switches

Before installing the switch, you need to decide what function is required of it, based on this, choose the type:

Ordinary.
With a light indicator - serve as a beacon to find the switch or signal in which rooms the light is on.

With a socket - usually used in the corridor near the sanitary rooms.
Concealed design - to place the working part inside the wall.
External execution - for placement of the case on a wall.

Criterias of choice

With all the variety of switches on the market, it is recommended to adhere to certain points:

Models with Modern convenient way to fix wires in the device.
No external damage - scratches, cracks, chips.
Reliable terminals that can firmly fix the wires.
Accurate operation of the keys with a characteristic click, without jamming.
The presence on the back of the device of the diagram, how to connect a triple switch.

Switch device

The principle of operation of the triple switch is no different from the double and single. Pressing the key to the "On" position closes the contact of the lighting circuit, voltage appears on the lighting device, and the light bulb lights up. Switching the key to the "Off" position opens the contact and the light goes out. So on each of the three keys. The switch consists of:

protective part - keys and frames;
working part - a mechanism for fixing wires and housing.

Switch connection

According to electrical safety, before working with wires, it is necessary to turn off the voltage by turning off the power switch. Before that, determine the wires with phase and zero using a voltage indicator.

If there is a hidden switch, then first of all you need to drill a technical hole for the socket with a drill with a special cone nozzle. A socket box is inserted into this opening, for a more durable installation of which an alabaster solution is used.

A copper four-core cable with a core cross section of 1.5 mm 2 is connected to this hole. It is recommended to process the ends of the wires. First, strip the insulation with a sharp knife or stripper. Then put on them tips corresponding to the terminals on the electrical device, and crimp them with a special hand tool - a crimper. If the crimper is not at hand, you can get by with a soldering iron, twisting the fibers of the core with your fingers and irradiating them. The simplest option is to simply insert the stripped ends of the wires into the clamping devices of the triple switch.

How to connect? The first core is connected to phase B on one side and to the common contact in the switch from the other end. Three other wires - to the three terminals of the switch, located opposite the common contact at one end, and each wire to the phase terminal of its lighting device (one of the three) from the other end of the cable. This can be seen in the wiring diagram of the triple switch. How to connect, see here.

Three coming from lighting fixtures are connected to each other and to zero coming from the automatic power supply.

There should be eight wires in the junction box - three of them come from the power supply (phase, zero and ground). Zero and ground go further to lighting fixtures, and three phase wires connected to three chandeliers are also connected to three wires that came from a triple switch. How to connect - detailed in the diagram.

In old wiring, the neutral wires were often twisted directly in the switch socket, behind the working device, and not in the junction box. Some electricians still practice this method to do without additional nodes in the circuit. Thus, there is no need to install a box, which is important for maintaining the appearance of the room, especially with expensive wall decoration.

An important rule is that the switch must always open the phase.

Connecting a switch with a socket

How to connect a triple switch with a socket? The diagram is shown below.

It is distinguished by the presence of another neutral wire that goes directly from the power supply and connects directly to the outlet. Such a device is used in the corridor, next to the sanitary facilities where a socket is needed, but it is not advisable to make another technical hole separately for the socket. It is also used when the socket is rarely needed, because the switch is usually mounted high from the floor level, and the electrical connector is just above the baseboard. And how to connect a triple switch with a socket so that it is convenient to use both the connector and the keys? You can choose the optimal height for comfortable operation of the device individually.

Undoubtedly, it is very convenient for controlling the light in the apartment. It is necessary to follow the rules of electrical safety when installing it, that is, before work, turn off the automatic power supply and check the absence of voltage with an indicator. After work, check the connection according to the diagram again and only then apply voltage to the network.

The most common electrical device in common areas is, along with a socket, a switch. The most common among them are single-key and two-key. But there are situations in which it is necessary to install a triple switch. About how to make the correct connection, both the device itself and the fixtures - this article.

There are a lot of options, but you should focus on the two most popular solutions:

Wiring for connecting a bathroom, toilet and kitchen (if the latter is far away, a separate switch is connected to it. Instead, it is advisable to use the third key to illuminate the corridor);
Branching of multi-track chandeliers. This makes it possible to save electricity, in which it is possible to turn on the lamps in three specific shades (or groups of shades), thus directing the light flux in the right direction. The solution is a budget replacement for dimmers, the cost of which is still several times higher than the cost of a switch.

The process of cabling and installation of the main and related wiring devices will be fundamentally different. However, the schema is unchanged. Assume for simplicity that there are three fixtures available.

Each of them has two wires for connection. From the mains, there are also 2 wires available - zero and phase. The phase wire is sent to a single terminal of the switch, the zero wire is sent straight, from the zero bus to the fixtures. From each lamp, one wire will go to each of the remaining switch clamps, depending on which of the lamps a particular key will be responsible for. The second contacts from the light bulbs must be connected to the neutral bus to the already connected neutral wire. Three lamps are working, the task is completed. About how to connect a three-gang switch for the options below for more information

Switch connection for three rooms

The process of conducting electricians in a house or apartment is approximately 95 percent the installation of electrical installation products and cables, as well as surface preparation. The remaining five are occupied by the connection process. Therefore (and especially) in the case of a 3-key switch, you need to design the entire plan before starting work.

Having chosen a place for switches, lamps and a junction box in which a zero bus will be installed, you need to take care of the question - how to run the cable:

In a private house, special fasteners with nails, as well as various corrugated sleeves, are used for this. The option with cable channels is becoming increasingly popular, as they are very diverse in appearance - from simple white to wood-colored options and the like;
In apartments, using the above options is not the best solution in terms of aesthetics. Therefore, there it is necessary to ditch the walls and thus obtain a channel for wiring the cable, fasten it into pre-prepared holes with special dowels and cover it with cement or another mixture.

If the plan is worked out, it is necessary to conduct a cable from the electrical panel. We lead the phase core from the circuit breaker, the zero one - from the zero bus.

Having reached the junction box, it is necessary to connect all the neutral wires together, if this has not been done before. In our case, a zero bus from 4 slots and above will help. One slot for entry and three for exit. Further, already single-core neutral wires will go one at a time directly to each of the lamps and will take place in one of its terminals.

The phase wire is not divided in the box - a triple switch serves for this purpose. The core falls on the common contact of the switch, which is usually located at the bottom. From above, 3 single-core wires will already come out, which, according to the prepared gates, are sent to connect the circuit on each of the lamps.

Separately, it should be noted that for the purpose of connecting kitchens or a corridor, as well as bathrooms and toilets, a more popular and reasonable solution is a switch box with a socket. It is connected in the same way as a 3-key switch, except that the phase wire to the key terminals will not come directly from the electrical panel (junction box), but first to the outlet, and from it it will already be divided into sections for each key. For this type of switch, you need to pull up another wire, along which another zero for the outlet is suitable. Zero will also pass first through the second contact of the socket.

Chandelier connection

The choice of chandeliers is currently so diverse that it is really difficult for the consumer to choose the best one from them. There are amazing design options with six, eight, ten or even more light bulb sockets that using a single-button switch for them is simply unwise in terms of energy savings. Of course, there is a compromise - dimmers, that is, soft start switches with a regulator, by rotating which you can achieve the desired brightness of the lamp. But, firstly, they are much more expensive, and secondly, energy-saving lamps from such a connection fail immediately (if you do not use special energy-saving lamps for dimmers, but this already costs a lot of money).

For a better understanding of the process, let's assume that there is a six-arm chandelier. The task is how to connect a three-key switch so that two chandelier horns are lit from each key. Turning the chandelier over, most likely, two wires from each horn will be visible. As a rule, they are color-coded, for example, red and blue. We collect all the blue wires in a bundle, connecting them in this way. This is an analogue of the zero bus from the first case. With red (or black, white - the color of the phase wire can vary widely, but it's definitely not blue), the situation is also simple, you just need to take two wires from those horns that should burn together from a specific key, and connect them between yourself.

The wires go to the switch in the same way as the first option, and now each phase wire needs to be put through the ceiling into the chandelier plate, where it is connected to those groups of wires that are responsible for specific cartridges. The neutral wire also passes into the chandelier and, using tinned twist or special terminals, is connected to a ready-made bundle of blue contacts.

Conclusion

The applications described above are popular, but not the only ones. According to the simple scheme described, it will be easy to connect blocks with four or more switches, the only difference will be that there will be as many phase wires as the device contains keys. In case the three-gang switch circuit is difficult to read from the text, the Internet provides many training videos. Having done such work once, there will be no problems with understanding the process. It remains only to be surprised - how easy and simple, it turns out, the situation is.